The first £1 million winner of ITV1 gameshow Red Or Black?, who was reportedly jailed for beating up a woman, will keep his prize, it has emerged.

The news came as ITV said it would be tightening background checks on contestants following the controversial win by Nathan Hageman.

The 31-year-old bricklayer was initially reported to have been jailed for attacking his ex-girlfriend’s boyfriend, but it has since been revealed that he attacked a woman, thought to be his ex.

There has been pressure on the broadcaster to strip Mr Hageman of his win, but a source close to the show confirmed he will be paid the cash.

In a statement an ITV spokesman said: “ITV and Syco (Cowell’s production company) have made thorough enquiries into Nathan Hageman’s participation on Red or Black? Whilst producers were aware that Nathan had served a prison sentence for assault they were not fully aware of facts which have since emerged. As a result of this ITV is reviewing the background checks on all remaining contestants in the show.”

A Reading Crown Court spokesman reportedly told The Sun and the Daily Mirror that the victim of the 2006 assault was a woman.

ITV knew about Mr Hageman’s five-year jail sentence, of which he served two-and-a-half years, but it is thought that they did not know that the victim was a woman.

Mr Hageman previously told journalists that he attacked a male victim after he started getting threatening calls from a man in Reading.